3.—(1) Where a notice, copy of an order, or copy of regulations is required by this Act, other than section 48, 60 or 61, or any regulation made under this Act to be served on, given or sent to a person, unless the context otherwise requires, it shall be addressed to him and shall be served on, given or sent to him in some one of the following ways:

(a) where it is addressed to him by name, by delivering it to him;

(b) by leaving it at the address at which he ordinarily resides or, in a case in which an address for service has been furnished, at that address;

(c) by sending it by post in a prepaid registered letter addressed to him at the address at which he ordinarily resides or, in a case in which an address for service has been furnished, at that address;

(d) where the address at which he ordinarily resides cannot be ascertained by reasonable inquiry and the notice or copy is so required or authorised to be served or given in respect of any land or premises, by delivering the notice or copy to some person over sixteen years of age resident or employed on such land or premises or by affixing it in a conspicuous position on or near such land or premises.

(2) Where a notice, copy of an order, or copy of regulations is required by this Act, other than section 48, 60 or 61, or any regulation made under this Act to be served on, given or sent to an occupier and the name of the occupier cannot be ascertained by reasonable inquiry, it may be addressed to “the occupier” without naming him.

(3) For the purposes of this section, a company within the meaning of the Companies Act, 1963, shall be deemed to be ordinarily resident at its registered office, and every other body corporate and every unincorporated body shall be deemed to be ordinarily resident at its principal office or place of business.